Source : Webster's Revised Unabridged Dictionary (1913)

Engregge \En*greg"ge\, v. t. [OF. engregier, from (assumed) LL.
   ingreviare; in + (assumed) grevis heavy, for L. gravis. Cf.
   {Aggravate}.]
   To aggravate; to make worse; to lie heavy on. [Obs.]
   --Chaucer.